Re: sync issues ftm 2012

I've had the sync seem to start working, then suddenly fail for the past few days. It failed after I created and saved the Sync Report. I was finally able to sync tonight successfully, though now I have several hundred people duplicated that were not duplicated before, so FTM has apparently gotten itself very confused somewhere. Does anyone know if the Compare/Merge option in FTM is reliable or do I have to check each duplicate manually?